look at the following alternat ways to get data out of the kernel: 1/ ipfw + divert 2/ netgraph (can attach to sockets and interfaces and can provide sockets and interfaces.. mix-n-match)
On Thu, 2 May 2002, Matt Impett wrote: > Hello all, > > I am implementing mobileIP in user space on freeBSD and was curious about > something. In order to do mobileIP IP address assignment, my process on > freeBSD has to be able to receive an IP packet and learn the source MAC > address that it came from (I am sure that the packet is only going one hop). > I have been able to do this using the BPF device, but am concerned about a > few things: > 1) When using the BPF device, the IP packet still goes to the IP stack, and > since I am no longer listening on the UDP port number, a ICMP port > unreachable is sent. I guess I could us ip_fw to fix this. > 2) When using the BPF device, I am bypassing the IP stack. Therefore, I am > losing things like reassembly, IPSEC, etc.. > > Is there another way to get this info up to an application without using > BPF? > > Likewise, I also want to be able to force IP packets out to a particular MAC > address, regardless of the IP destination address of the packet. Once > again, I know BPF can do this, but then I have similar concerns to the ones > above. For example, what do I set the IP ID field to?? If I accidentally > match an ID field that the kernel has used previously, then reassembly could > get confused on the end host. > > thanks a lot, > matt > > To Unsubscribe: send mail to [EMAIL PROTECTED] > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-net" in the body of the message
